会議の進行を ___ するために、議題を整理した。
The correct answer is 「円滑」(えんかつ), meaning "smooth" or "harmonious." To ensure the meeting proceeds smoothly, organizing the agenda is a logical step. 「円滑」 describes a state where things progress without obstruction or trouble. 「活発」(かっぱつ) means "lively" or "active"; while a lively meeting might be good, the primary goal of organizing an agenda is usually for smooth operation rather than just activeness. 「迅速」(じんそく) means "rapid" or "prompt"; while efficiency is good, the agenda organization aims for smoothness first. 「停滞」(ていたい) means "stagnation" or "delay"; this is the opposite of the desired outcome for a meeting.
正解は「円滑(えんかつ)」です。会議の進行が「滞りなくスムーズに進む」ように、議題を整理するという意味に合います。「活発」は活動が盛んなこと、「迅速」は素早いこと、「停滞」は物事が滞ること。停滞は望ましくない状態であり、他の選択肢は文脈に合いません。
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